On 01/21/2013 11:16 AM, Arnd Bergmann wrote:

The omapdrm driver is incorrectly flagged to allow building
on non-omap platforms, when ARCH_MULTIPLATFORM is set.

This does not work, because it unconditionally selects
the OMAP2_DSS symbol that only works on OMAP.
The problem was introduced in 5e3b087499 "staging:
drm/omap: add support for ARCH_MULTIPLATFORM", which this
patch partly reverts.

Are you sure OMAP2_DSS requires ARCH_OMAP2PLUS?  I don't see this, and 
it at least used to not depend on ARCH_OMAP2PLUS.  If it does now, I 
think the correct fix would be to remove the dependency in OMAP2_DSS.  I 
don't think removing ARCH_MULTIPLATFORM support in omapdrm is the 
correct solution.

Without this patch, building allyesconfig results in:

warning: (VIDEO_OMAP2_VOUT && DRM_OMAP) selects OMAP2_DSS which has unmet direct dependencies (HAS_IOMEM && ARCH_OMAP2PLUS)
warning: (VIDEO_OMAP2_VOUT && DRM_OMAP) selects OMAP2_DSS which has unmet direct dependencies (HAS_IOMEM && ARCH_OMAP2PLUS)
drivers/video/omap2/dss/dss.c: In function 'dss_calc_clock_div':
drivers/video/omap2/dss/dss.c:572:20: error: 'CONFIG_OMAP2_DSS_MIN_FCK_PER_PCK' undeclared (first use in this function)
drivers/video/omap2/dss/dss.c:572:20: note: each undeclared identifier is reported only once for each function it appears in
drivers/staging/omapdrm/omap_connector.c: In function 'omap_connector_dpms':
drivers/staging/omapdrm/omap_connector.c:116:8: error: 'OMAP_DSS_DISPLAY_SUSPENDED' undeclared (first use in this function)
drivers/staging/omapdrm/omap_connector.c:116:8: note: each undeclared identifier is reported only once for each function it appears in

This was an unrelated build break which should be fixed in latest master 
after 'staging: drm/omap: use omapdss low level API'

BR,
-R